The essential oil industry recognizes that some essential oils have menstrual function, so menstrual period and pregnancy are not suitable. My personal opinion is that it varies from person to person and from oil to oil. Especially there are many massage oils called essential oils on the market at present. I don't know if you use pure ones.

Practice is the only criterion for testing truth. If you feel that the menstrual flow increases significantly after use, of course, it is best to avoid using it.